three.js, dat.GUI slider controlled by code, morph targets do not move - opencv

Question

I work on a human face that the mouth should move about external coordinates (OpenCV and dlibs). In a first step I try to control the dat.GUI by code, which already works. But now I have the problem that the morph targets do not move when I control by code. The sliders move, but the face doesn't. When I use the mouse, they work perfectly. I ask for help with this problem.
<script>
// Laden der 3DScene
var scene = new THREE.Scene();
// Laden der Kamear Perspektive
var camera = new THREE.PerspectiveCamera(15, window.innerWidth/window.innerHeight, 1, 10000);
camera.position.z = 17;
camera.position.y = 3;
// Laden des Renderers
var renderer = new THREE.WebGLRenderer({ alpha: false });
renderer.setClearColor( 0x000000 );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
// Laden des Orbitcontrollers
var controls = new THREE.OrbitControls( camera, renderer.domElement );
// Laden der Lichter (Beleuchtung)
var ambientLight = new THREE.AmbientLight(0x111111);
scene.add(ambientLight);
var light = new THREE.PointLight( 0xFFFFDD );
light.position.set( -15, 10, 15 );
scene.add(light);
// Laden des Json Modells
var loader = new THREE.JSONLoader();
loader.load( "./three/models/JSON/test/mkh_shapes.json", function (geometry) {
var material = new THREE.MeshLambertMaterial({morphTargets: true});
var mesh = new THREE.Mesh(geometry, material);
mesh.scale.set(1.2,1.2,1.2); //Modellgrösse die angezeigt wird
mesh.position.x = 0; //Position (x = nach rechts+ links-)
mesh.position.y = -19; //Position (y = nach oben +, unten-)
mesh.position.z = 0; //Position (z = nach vorne +, hinten-)
scene.add(mesh);
//dat.Gui
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
var shape = {
mouth_open: 0.0, //Anfangsposition 0.0
};
var gui = new dat.GUI();
var folder = gui.addFolder( 'Morph Targets' );
folder.add( shape, 'mouth_open', 0, 1 ).step( 0.01 ).name('mouth_open').listen().onChange ( function( a ) { mesh.morphTargetInfluences[ 40 ] = a;} );
folder.open();
var updateGui = function() {
for (var i in folder.__controllers) {
folder.__controllers[i].updateDisplay();
}
}
var time = Date.now() * 0.003;
shape.mouth_open = 0.50 //* Math.sin( 0.5 * time ) + 0.3;
//scene.add(shape);
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
});
function animate() {
render();
requestAnimationFrame( animate );
}
function render() {
renderer.clear();
renderer.render( scene, camera );
}
animate();
</script>

Answer 1

I have made my own version with extra features like :
Gui auto resize based on content div.
Improved slidecontroller as unique controller (slide or number insert);
Multi language automatic support
Auto check for conflicts in options, then ask for confirm or cancel.
Auto Show/hide other controllers when option selected deselected (example show color list only if "custom color is selected")
ecc.. ecc..
here is the Video
Now is more confortable and easy to use.